What causes a Dell Latitude D600 to lock up when the Aironet Cardbus (Air-CB21AG-A-K9) installed?

Everytime I plug in the Aironet Cardbus (Air-CB21AG-A-K9), my Dell Latitude D600 laptop freezes up. I have to shut down the laptop manually and restart without the adapter. I have installed the latest software for this adapter. I tried with a different Aironet adapter, still freezing up. What could be the problem?